v3.25.2
Shareholder Report
 6 Months Ended
Jul. 31, 2025
USD ($)
shares
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name Fidelity Select Portfolios
Entity Central Index Key 0000320351
Entity Investment Company Type N-1A
Document Period End Date Jul. 31, 2025
Fidelity Telecom and Utilities Fund  
Shareholder Report [Line Items]  
Fund Name Fidelity® Telecom and Utilities Fund
Class Name Fidelity® Telecom and Utilities Fund
Trading Symbol FIUIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Telecom and Utilities Fund for the period February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-800-544-8544
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Fidelity® Telecom and Utilities Fund 
$ 35 
0.66%
  
Expenses Paid, Amount $ 35
Expense Ratio, Percent 0.66%
Net Assets $ 1,689,118,674
Holdings Count | shares 36
Investment Company Portfolio Turnover 145.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of July 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$1,689,118,674
  
Number of Holdings
36
  
Portfolio Turnover
145%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Electric Utilities 44.4   Diversified Telecommunication Services 18.5   Multi-Utilities 13.3   Independent Power and Renewable Electricity Producers 8.2   Wireless Telecommunication Services 7.7   Oil, Gas & Consumable Fuels 2.2   Electrical Equipment 1.9   Construction & Engineering 1.3   Semiconductors & Semiconductor Equipment 0.9   Media 0.9       Common Stocks 99.3 Short-Term Investments and Net Other Assets (Liabilities) 0.7 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 99.3                       Short-Term Investments and Net Other Assets (Liabilities) - 0.7   United States 94.8 Canada 2.8 Germany 1.4 United Kingdom 1.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 94.8                       Canada - 2.8                               Germany - 1.4                              United Kingdom - 1.0                          
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Verizon Communications Inc 12.3   NextEra Energy Inc 8.8   Constellation Energy Corp 7.4   Vistra Corp 6.2   Duke Energy Corp 5.7   T-Mobile US Inc 5.1   Sempra 5.0   Exelon Corp 4.0   Entergy Corp 3.7   NRG Energy Inc 3.6     61.8